The use of infrared radiation to detect hidden objects under layers of clothing

A. Andonova1, G. Mihov1 and A. Bekiarski1

1Technical University – Sofia, Bulgaria

Keywords: infrared radiation, thermohraphy, images processing
property: TUS
material: paper

Previous studies using infrared detectors for hidden object detection have tried to observe the image of the weapon. The research presented here may lead to creating a detection system using these models as a comparator and signal for detection. It was confirmed that in a warm environment objects of lower emissivity can be seen at greater distances. It was also confirmed that larger objects can be seen at greater distances. Lastly, it was found that as more layers of clothing are worn, the temperatures on the exterior layers of clothing approach the ambient environmental temperature. It is used an actual human in the indoor setting. These tests were a continuation of the phase one tests, but they had the added human element. It was found that the material of the hidden object ( for example a bomb) can have a significant effect on the temperature measured by the camera. It was also found that convective cooling due to movements of the human body is an important modeling aspect that must be accurately modeled. The next experiments was completed in an uncontrolled outdoor environment with a human subject. As the tests in this phase were conducted outside, it was found the clothing temperatures were very dependent on the irradiation levels. It was also found the certain clothing characteristics such as screen printing or embroidery may appear in infrared images and possibly distort the image of concealed objects. The range determined in this study, 7 to 10% of the temperature scale, which allows for human visual recognition of the hidden (bomb) package, is a range that the operator would be relatively certain that an object was being concealed.

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